Abstract

It is known that the height anomalies computed with gravity data by use of numerical integration, fast Fourier transformation or collocation and others normally determine the global quasigeoid concerned to the global reference system and the globally averaged equipotential surface of the initial point. But different territories are interested in having their own tide-gauge. The value of a gravity potential at such local tide-gauge is practically unknown and differs from the global one. This causes changes of the received normal height and height anomaly. In the paper there are given an overview of the calculations allowing to evaluate dislocations of the local quasigeoid compared to the corresponding global surface and introduced some results of the relevant experiments in Vietnam.